Staking machine



Feb. 20, 1934. A, SCZHETTLER 1,947,619

STAKING MACHINE Filed Sept. 10. 1930 ha/VgA/TOR Patented F eb. 20, 1934 'UiNl 'lE D is STAKING MACHINE Application September 10, 1930, .Serial No. 480,898, aridi in fGreatqBritain September 19,

2.29.01aims.

This invention relates to machines for treating hides, skins, leathenandcther similar piecescf work and is illustrated-as embodied in a stakin machine for stretching: and softeningpiecesof leather. It is to be understood, however,.that the invention and various important features thereof may have other applicationsandnses.

In United States Letters Patent No.. 1,101,763, granted June 30, .1914, upon application ofFJF. Slocomb, there is disclosed-a staking machine provided with a pair of staking tools arranged to co-operate with a member having-a recess, the arrangement being such that one of' the-staking tools forces a portion of the piece ofwork undergoing treatment into the recess, .so thatasthe said member and the tools reciprocate together, during work-treating operations, portionsof the work are forced into the recess and around the edge of the tool projecting into the recess. This machine was not entirely satisfactory due to the fact that the last portion of the work topass by the edge of the tool in each operative stroke thereof was not treated as effectively as the restof the work. It will be understood that, in the operation of the machine, the tool not in the-recessserves to hold the work frictionally and thus co-operates with the tool which presses the workinto .the recess. When, however, at the last-part ofethe stroke this co-operating tool drops ofi of the work, the latter is at once released-so that it :passes around the edge of the tool in the recess with much less tension upon it and hence is not so efiectively treated. Moreover, in the patented machine, wherein the tools yieldindividually with respect to the work, no provision was made for varyingselfadjustingly the total pressure of the tools on the work to ensure proper accommodationiof thetools to variations in the thickness of the portions of the work passing under the tools at any given instant.

Objects of this invention are to improve-the quality or" the results obtained in stakingroperations in general, and-more specifically,- to improve the operation of machinesofthe type of--:the patented machine mentioned in the foregoing paragraph.

To this end and in accordancewithranimpcrtant feature of the invention, meansis provided for supporting portions of the work againstthe thrust of work treating tools so-constructed-and arranged as to insure the desired treatmentiof all portions of the work, including thelmarginal portions thereof, by increasing the toolefiectiveness on said marginal portions. Conveniently, the tools are so arranged that as one tool drops off the edge of the work another tool, presses with parts shown in Figr 1;

,of Fig. 1.

l4 which is slidable in machine frame 5 above aninclinedwork table or bed 6 rigidly mounted by ibrackets=8 (Fig. 3) on a movable support *comprisingzspaced members 6 inwhich a slide -7-travels, said slide '7 being retained. on the member 6 .by'strips '7 which overlap reduced 100 aflangeg portions of the-slide '7 as shown in Fig. 3.

increased. pressure upon the'work, thus compeneating for the st vtension normally effected by .of the work are pressed by a pair of work-treating .tools mounted for independent movement relativelyto each other, so that .as one tool drops off the work the other tool will receive all ofthe,

,pressure theretofore borne. by both tools.

.In orderthat variations in the thickness of the work. in the path otthe tools may be accommodated to secure the best results, means is preferably provided for applying a predetermined. f0 .pressure to the tools comprising spring means permitting the tools to yield together away from a work-supporting member, means being also ,provided'for permitting yielding of each tool,

individually.

.These and otherfeatures of the invention and novelcombinations of parts will now bedescribedin detail. and then pointed out more specifically in the appended; claims.

ZIni the, drawing, 1Fig.,1 is a view in side elevationof the opera- .tive-parts ofa staking machine illustrating one embodiment of the invention;

.FiglZis an enlarged view of the work-treating .85 1Fig. 3,is a view of the work-treating parts .lookingfromthe left in Fig. 2; and

Fig.4 .isla planeview, on. a smaller scale, of the worksupportingparts taken on line IVIV "00 .In theillustrative.embodiment of the inven- ..tion,.designed for use. in. staking operations upon .hidesandskins a .tool head 1 is suspended from a lever.2..pivotally mounted at 3 on a carriage The carriage A and slide 7 are connected by a link8=and reciprocated by a crank (not shown) through a" connecting rod-9, link 8 being connected to slide 71 by curved arms 9 rigid with the slide-'7. As shown, rod 9 is connected pivotally .to carriage 4 by a gudgeon pin 10. On aniarm .of the-rod 9 extending upwardly from -pin'10 isa cam 11 oscillated during the opera- -tivevstrokes of the working tool and slide, so

that the lever 2 is caused to push a tool 12 on tool head 1 into a gap or recess 13 in the slide 7. The gap or recess is formed by two spaced transverse jaws or bars 14 (Fig. 2) secured to the slide 7. Secured to each end of the slide 7, which is of limited length, is a belt 14 which passes around rollers 14 and 14 journaled in the movable support comprising spaced members 6 Since the slide '7 is reciprocated in the space between the members 6 it is perforce limited in its length dimension, and it is to support the work and prevent it from sagging or dropping into the space between the members 6 that the belt 14 is provided. In order that the slide 7 with its recess 13 may be moved upwardly to operative position wherein the tool 12 may push a portion of the work down into the recess 13, the movable support comprising the spaced members 6 is mounted for movement in a vertical direction between guide members 14 (Fig. 3) and is operated by a treadle (not shown), all as fully described in said Letters Patent No. 1,101,763.

A block 15 is provided in the gap or recess 13 upon which the work a is pressed by the working tool 12. The block 15 conveniently consists of a piece of hard wood such, for example, as lignum vitae, and has a groove 16 in one face. The block is inserted between the said jaws or bars 14 with the groove uppermost and rests upon the slide '7. While any suitable means such as screws may be adopted for securing the block in position, it is preferred to make the block a push fit between the bars or jaws. This method has the advantage of being both simple and effective and, moreover, a block can be readily inserted and removed. If desired, blocks respectively formed with different grooves may be provided for use in conjunction with different tools, said blocks being interchangeable.

In connecting the tool head 1 with the cam actuated lever 2, according to one construction, said lever 2 has a plurality of studs 17 fixed vert-ically therein and the tool head 1 is attached to one end of a rod or link 18 which, at the other end, is pivotally connected to a block 19 slidable on the studs 17 in the lever 2. Strong compression springs 20 are provided on the studs above the block 19 and are held in position thereon by nuts 21 and washers 22. By reason of this arrangement the tool head 1 can yield, if. and

when (as the tool presses the work on to the block in the slide) variations in the thickness ber buffer, indicated generally at 24, the machine can be adapted to perform setting operations on pieces of leather very satisfactorily.

In the illustrated machine, during the main part of the working stroke the tools 12 and 23 press on the work to an extent determined by the regulation of the spring means 20 and the rubber buffer 24 associated with the back tool. The pressure on either tool can never exceed the pressure exerted by the spring means 20. When,

towa d t e nd of each Work ng stroke, theback tool 23 leaves the work, the pressure on this tool is relieved and the whole of the pressure exerted by the spring means 20, which previously was divided between the two tools, is concentrated on the front tool 12, i. e., the pressure on the front tool 12 automatically increases after the back tool 23 has left the work. As the tensioning effect of the back tool 23 on the work is lost, the concentration of the whole of the pressure on the front tool 12 is beneficial for the reason that the remainder of the work, which is about 1 inch or 1 inches in width, receives the additional pressure and is especially stretched or softened.

For mounting the staking tool 12 on the tool head 1 there is provided a member 30 pivoted at 32 on the head 1, the upper end of the member 30 having a screw threaded opening for reception of a pin 34. As shown most clearly in Fig. 2 of the drawings, the pin 34 extends loosely through an opening in a bracket 36 rigid with the tool head 1 and has mounted thereon a rubber cushion 38. For holding the rubber cushion 38 on the pin 34 there is provided a locking nut and an abutment member both indicated at 40.

Upon rotating the locking nut and abutment member 40 in the proper direction, tension on the rubber cushion 38 may be varied as desired. It is clear from the above description that the staking tool 12 may yield in a direction away from the arrow in Fig. 2 through compression of the rubber cushion 38. Similarly the tool 23 may yield upwardly away from the block 14, to

accommodate thicker portions of the work, through compression of the rubber cushion 24. As heretofore stated both tools 12 and 23 may yield in a direction away from the work, to accommodate thicker portions thereof, through compression of springs 20 mounted upon the studs 17 carried by the lever 2.

v For clamping a piece of work upon the table 6 there is provided, in the illustrated construction, a clamping member having a work contacting pad 52 at its lower end and an intermediate perforated portion 54 for the reception of a pivot pin 56 by which the member 50 is pivoted to the machine frame 5. Pivotally attached to the upper end of the clamping member 50 at 58 is av link 60 the other end of which is in turn pivoted to the upper end of a lever 62 the lower end of which has pivotally attached thereto a connecting rod 64 arranged to be operated by means (not shown) to cause the clamping member 50 alternately to clamp and release a piece of work placed in position upon the table or bed 6.

In the operation of the machine, a piece of leather to be staked is introduced by the operator and placed upon the table or bed 6, a portion of the piece of leather being arranged to project over the front end of the table 6 between it and the clamping pad 52. When the machine is ready for staking operations, it is being run continuously through power means (not shown) provided for the purpose. During this continuous operation, the slide 7 and the carriage 4 (carrying the tools 12 and 13) are reciprocated back and forth at relatively rapid rate. But it is only when the operator elevates the vertically movable support for the slide '7 by depressing the treadle (not shown) that operations on the work take place. The skilled operator will depress the treadle at the instant the slide 7 and the carriage 4 are at the limit of their travel toward the left in Fig. 1. Immediately thereafter the staking tools 12 and 23 press portions of the work against the block 15 and the block 14, respectively. After engagement of the staking toolswi'th thework has taken place in the mannernescribedabove, the tools and the slide 7 are,toge'ther"with the blocks 14 and 15, moved rearwardly inadirection away from the clamping pad 52 in'Fig. 1 whereby a strip portion of the'work is caused to pass between the tools and the co-operating surface on the blocks 14, 15, the result being a staking operation upon the strip portion'of the workextending up to the very edge of the work in the path of the tools. As soonas the tools have reached the rear end of their stroke they rise to'releasethe-work, the clamp being also moved to releasing position'at the same time, thus permitting the "operator to shift the work to a new'position preliminarily to a repetition of the operative stroke of the tools and slide. These operations are repeated on a given piece of work each timethe operator depresses the treadle until all'portions have been operated upon.

Having thus describedmy invention, whatI claim as new and desire to secure by Letters Patent of the United States is:

1. In a machine 'for operating upon hides, skins, leather and other similar pieces of work; a plurality of tools mounted for relative movement with respect to each other, a member for supporting portions of a piece of Work against the thrust of said tools, means to cause relative movement between the piece of work and the tools inthe direction of a linear dimension of the work while the tools are pressing the work against said member, and means to cause one of the tools to increase its pressure on the work at a'predetermined distance from an edge portion thereof.

2. In a machine for operating upon hides, skins, leather andother similar pieces of -work,' a pair of tools mounted for relative movement'with respect to each other, a member for supporting portions of a piece of work against the thrust of said tools,means to cause relative movement between the piece of work and the tools in the direction of a linear dimension of a the *work and of the spacing of the tools with respect to each other, whereby the tools operate upon-"successive portions of the piece of workfione tool in advance of the other, while both tools 'pressthe work against said member, and'means to'cause one tool to increase itspressu're'on marginal portions of the work as they pass-from the-other tool in advanced position.

3; In a machine for operating upon' hides, skins, leather and other similar pie'cesof work, alplurality of tools mounted for relative movement with respect to each other, means'arranged'to' support portions of the work against'the thrust 'of the tools, means to cause relative movement between the work and said tools, the tools-being arranged to press portions of the"wo'rkagainst said supporting means, and means to 'cause' one of the tools to increase its pressure on the-"work as another of the tools drops 01f an edge portion of the work.

4. In a machine for operating upon hides, skins, leather and othersimilar pieces ofwork, a plurality of tools mounted for relative movement with respect to each other, means arranged to support portions of the'work against the thrust of the tools, means to cause relative'movement between the Work and said tools, the tools being arranged to press portions of the work against said supporting means, and means to cause one of the tools to increase its pressure on the'work in its line of thrust in timed relation to release of the work by another tool.

'5.'In--amachine foroperating upon hides, skins, leather and-other similarpieces of work, a plurality of' tools for operating on the work,

for movement independently of each other," and means to cause one of the tools to increase its pressure'on thework as another of the tools drops as an edge'portion of the work.

6; In a machine for operating upon hides, skins, leather and other similar pieces of work, apluralityof tools for operating on the work, one tool having abladed'cdge'fm' treating the work and 'another' toolhavinga work contacting edge for putting pressure on the work, means to cause relative movement between the-Work and said tools,

meansarranged tosupport the work comprising a member having a grooved surface to support the work inthe line or thrust of the bladed tool,

and means to-mount the blade-edged tool for yielding contactwith the portion-of the work on said grooved surface.

7. In a machine for operating upon hides,

'- skins, leather-and other-similar pieces of work,

a plurality oftools comprising a bladed tool movable relatively to another tool, means arranged to support a portion of a piece of work against the thrust of the tools, means to cause relative movement 'betweenthe tools and the work in the direction of a linear dimension of the 'latter while a portion thereof is being pressed by the' tools-against said work supporting means, and means to -movethe tools-so thatfthey press portions of the work upon said work supporting means in a direction substantially normal to the work supporting surface'thereof, said work supporting'ineans comprising a member arranged k the "Work in'the' line r thrust of'the bladed-toohand means to cause increase of pressure of the bladed tool on the work when saidother tool drops off the end of the work.

8. In a machine'foroperating upon hides, skins, leather and other similar pieces of work,

'a'plurality oftools, a member for supporting a portion of a piece of work against the thrust of the tools, means to cause relative movement between thepiece of "work'and the tools in the direction of a linear dimension of the work Wherebythework moves relatively to the tools "while'portions thereof are being pressed by the 'toolsngainst said memben'and means to move the tools so that they press portions of the Work upon-"saidmember in a direction substantially "normal to the-work supporting surface of said member, said last-mentioned means comprising- 'm'eans-'to cause one of the tools to operate at an increased'pressure onm arginal portions of the 'wo'rk.

'9. In'a machine for operating upon hides,

work against the thrust of said tools, means to cause relative'movement between the piece of 'workand the tools in the direction of a linear "dimension of the workwhile the tools are press- 'ing the work against said members, means to press the tools toward'said members, said tools being"mounted for independent movement with respect to "each other, and means rendered operative by one tool dropping off the rear end of the work to cause another tool to receive an increased pressure corresponding to that released by the tool which has just become inoperative.

10. In a machine for operating upon hides, skins, leather and other similar pieces of work, a plurality of tools for operating on a piece of work, means arranged to support portions of the work against the thrust of the tools, means to cause relative movement between the workv and said tools, the tools being arranged to press portions of the work against said supporting means in directions normal to the supporting surface of the supporting means, means to mount the tools independently of each other, and a single means arranged to press both tools against the work whereby as one tool drops off the rear end of the work another tool receives the pressure released by the tool which has justbecome inoperative.

11. In a machine for operating upon hides,

skins, leather and other similar pieces of work,

a plurality of tools, a member arranged to support a portion of a piece of work against the thrust of the tools, means to cause relative movement between the piece of work and the tools in the direction of a linear dimension of the work while the tools are pressing the work against-said member, means to move the tools so that they press portions of the work upon said member in a direction substantially normal to the'work supporting surface of said member, and a, single means arranged to press the tools againstthe Work, said tools being mounted for relative movement while under pressure so that as one tool drops off of the work another tool operates with an increased pressure corresponding to that released by the tool which has just become inoperative.

12. In a machine for operating upon hides, skins, leather and other similar pieces of work, a pair of work treating tools, a slide arranged to support a portion of the work, said slide having a block to back a portion of the work against the thrust of one of the tools, a second block to support another portion of the work against the thrust of another work treating tool, means to cause the slide and the tools to move while the work is held stationary whereby the work is treated by the tools, and means to cause one .of the tools to press with increased pressure on its block when the other tool drops off of the end of the work.

13. In a machine for operating upon hides, skins, leather and other similar piecesof work, a pair of work treating tools, a slide arranged to support a portion of the work, said slide having a recess, a block located in the recess and having a work supporting surface below} the surface of the slide, one of the tools being arranged to co-operate with the Work supporting surface of the block while the other tool holds another portion of the work against the'work supporting surface of the slide, means to move the slide and the tools relatively to the work, and means to cause one of the tools to engage the work with increased pressure upon a marginal portion thereof.

14. In a machine for operating upon hides, skins, leather and other similar pieces of work, a pair of work treating tools, a slide arranged to support a portion of the work, said slide having a block to back a portion of the work against the thrust of one of the tools, a second block arranged to support another portion of the work 15. In a machine for-operating upon hides,

skins, leather and other similar pieces of work, a pair of work treating tools,a slide arranged to support a portion of the work, said slide having a recess, a block located in the recess and havingv a Work supporting surface below the surface of the slide, one of the tools being arranged to cooperate with the .worksupporting surface of the block whilethe other; tool holds another portion of the work against the work supporting surface of the slide, means to move the slide and the tools' relatively to the work, means to mount the tools for movement independent of each other, and means to cause the tool and block to engage the work with increased pressure at the instant the other tool and the slide cease to engage the work.

16. In a machine for operating upon hides, skins, leather and other similar pieces of work, a plurality of work contacting tools, a slide having surfaces to support portions of a piece of work against the thrust of the said tools, means common to both tools yieldingly to press the tools against portions of the work where it is backed by the Work supporting surfaces of the slide, means to cause movement of the tools and-the slide relatively to the work whereby the tools are caused to operate on the work as the latter passes between the tools and the work supporting surfaces, and means to mount the tools for movement relatively to each other so that as one tool drops off the edge of the work beforeanother, said other tool receives the yielding pressure formerly received by the tool which has just become inoperative.

17. In a machine for operating upon hides, skins, leather and other similar pieces of work, a plurality of work contacting tools, a slide having surfaces arranged to support portions of a piece of work against the thrust of the said tools, means yieldingly to back each tool so that it may yield to accommodate portions of the work of different thicknesses upon the work supporting surfaces of the slide, means to cause movement of the tools and the slide relatively to the work whereby the tools are caused to operate on successive portions of the work during relative movement of the latter with respect to the tools and the work supporting surfaces, a tool head arranged to support the tools, and means arranged to press the tool head yieldingly toward theslide so that the total pressure on the tool head may be supported by one or both tool-s whereby as onetool drops off the work another tool receives the yielding pressure formerly received by the tool which has just become inoperative.

18. In a machine for operating upon hides, skins, leather and other similar pieces of work, a surface against which a portion of a piece of work may be clamped, a pair of tools to ment relatively to each other andto the slide to press the said portions of the work against the work supporting surfaces in directions nor.- mal to those surfaces, and means to cause, move:

ment of the tools and slide in a direction away.

from said clamping surface.

19. Ina machine for. operating upon hides,

work supporting. surface, a tool head to support the. tools, means to press the tool head and tools yieldingly toward the work supporting surface,

and means associated with the tools and tool head yieldingly to back the tools to permit them to accommodate themselves to variations. in.

thickness of the work passing over said work supporting surface during the operation of the tools.

20. In a machine for operating uponhides, skins, leather and other similar pieces of work, a pair of staking tools to operate on a piece of work, a slide having two surfaces at diiferent levels with respect to each other to support spaced portions of a piece of work, the tools being mounted for movement relatively to each other and to the slide to press the work against the work supporting surfaces in directions normal to those surfaces, and means to cause movement of the tools and the slide in a direction substantially parallel to a plane coinciding with one of the work supporting surfaces of the slide.

21. In a machine for operating upon hides, skins, leather and other similar pieces of work, a pair of staking tools to operate on a piece of work, a slide having a recess and a work supporting block in the recess, said slide and block each having a work supporting surface, a tool head to support the tools, means to press the tool head and tools yieldingly toward the work supporting surfaces of the slide and block, means to move the slide and tools relatively to the work, and means associated with the tools and tool head yieldingly to back the tools to permit them to accommodate themselves to variations in thickness of the work upon said work supporting surfaces during the operation of the tools.

22, In a machine for operating upon hides, skins, leather and other similar pieces of work, a pair of tools co-operating with each other for stretching operations upon a piece of work, a slide arranged to support portions of the piece of work against the thrust of the two tools, a tool head, means to press the tool head and the tools yieldingly toward the work, means yieldingly to hold the tools in predetermined positions relatively to each other on the tool head, and means to cause movement of the tools and slide in a plane substantially parallel to the work supporting surface of the slide, said slide having a grooved block located below the surface of the slide for P receiving a portion of the piece of work as it is forced thereagainst by one of the tools, the construction and arrangement being such that the tool which co-operates with the grooved block receives increased pressure at the instant that the other tool drops off the rear edge of the work a during the described relative movement of the and tools ,yieldinglytoward the slide, and means to. cause movement. of the tools and slide in a plane substantially parallel to the work support.-.

ing surface of the slide, said slide having, a grooved block located below the surface of th e slide for receivinga portion of the piece of work as it .is forced-ithereinlby one of the tools, the constructionand arrangement being such that the tool which co-operates with the grooved block receives increased pressure at the instant that the. other tool drops off the rear edge of the work duringthe described relative movement of the work and tools.

24 In amachine for operating uponhides, skins, leather and other similar pieces of work, a staking tool, a-tool for co-operationwith the first-mentioned tool in stretching operations on a piece of work, a slide having upwardly facing surfaces arranged to support portions of a. piece of work against the thrust of said tools, means toclamp a piece of work'and hold it against movementin onedirection, means to move the tools intoyielding contact. with portions of the work located on said work supporting surfaces, and means to move the tools and the slide after they have contacted with the work in a direction away from the clamping means to operate along a strip of the work extending in a direction away from the clamping means.

25. In a machine for operating upon hides, skins, leather and other similar pieces of work, a staking tool, a tool for co-operation with the first-mentioned tool in stretching operations on a piece of work, means having upwardly facing surfaces arranged to support portions of a piece of work against the thrust of said tools, a tool head, means to mount the tools on the tool head to yield individually, and means to mount the tools and tool head to yield together away from the work supporting means.

26. In a machine for operating upon hides, skins, leather and other similar pieces of work, a staking tool, a tool for co-operation with the first-mentioned tool in stretching operations on a piece of work, a slide having upwardly facing surfaces arranged to support portions of a piece of work against the thrust of said tools, means to clamp a piece of work and hold it against movement in one direction, a tool head, means to mount the tools on the tool head for yielding movement relatively to each other, means to move the tools into yielding contact with portions of the work located above said work supporting surfaces, and means to move the tools and the slide after they have contacted with the work in a direction away from the clamping means to operate along a strip of the work extending in a direction away from the clamping means.

27. In a machine for operating upon hides, skins, leather and other similar pieces of work, a staking tool, a tool for co-operation with the staking tool during a stretching operation upon a piece of work, a work support having a grooved block for co-operation with the staking tool and also a work supporting surface for co-operation with the second-mentioned tool, means to cause relative movement between the tools and the work to stretch the latter, a tool head to support the tools, means comprising a lever constructed and arranged to move the tool head and tools in a direction toward the grooved block and slide, spring means interposed between the lever and the tool head whereby both tools are pressed I the tool head, spring means to force the tool head ISQ yieldingly. upon the work, and means to mount the tools for independent movement upon the tool head, whereby when one tool releases the work the other tool takes the full pressure of the spring means interposed between the lever and the tool head.

28. In a machine for operating upon hides, skins, leather and other similar pieces of work, a staking tool, a tool for co-operation with the staking tool during a stretching operation upon a piece of work, a work support having a grooved block for co-operation with the staking tool and also a work supporting surface force-operation with the second-mentioned tool, means for causing relative movement between the work and the tools and work support in a direction to stretch the work, a tool head to support the tools, yielding means associated with the tools and with the tool i head yieldingly to hold the tools in predetermined 2O relation to each other as they engage'the work, means comprising a lever constructed and arranged to move the tool head and tools in a direction toward the grooved block and slide, spring means interposed between the lever and the tool a plurality of tools for operating on the work;

means arranged to support portions of the work against the thrust of the tools, means to cause relative movement between the tools and the work in the direction of a linear dimension, of the latter, the tools being yieldingly mounted to press portions of the work with a yielding pressure against said supporting means, and means to increase the work treating effect of one of the tools as another of the tools drops off the work,

whereby marginal portions of the work are effectively treated despite the reduction in the number of tools operating on said marginal portions.

GUSTAV ADOLF SCHETTLER. 

